Power-transmission mechanism.



PATENTEI) 0GT. 30, 190 6.

. D. M. WRIGHT. POWER TRANSMISSION MECHANISM.

I No. 834,438.

APPLICATION FILED APBH'Q; 1906.

UNITED STATES PATENT CEEICE.

DANIEL M. WRIGHT, CE HARTFORD. CONNECTICUT, ASSIGNOR To THE HENRY &. WRIGHT MANUFAUTURINGCOMPANY, OF HARTFORD, CoN- NEOTIOUT, A CORPORATION or CONNECTICUT,

POWER-TRANSMISSION MECHANISM.

Specification of Letters Patent. Patented Oct. 30, 1906.

' citizen of the United Application filed April 9, 1906: Serial No. 310,666.

To all whom it may concern:

Be it known that I, DANIEL M. WRIGH a States, residin at Hartford,'in the county of Hartford and State of Connecticut, have invented a new and useful Power Transmission Mechanism, 'of which the following is a specification.

This invention relates to a mechanism for transmitting ower to a rotatory tool-spindle that is held by an oscillatory support.

f The object of the invention is to provide a simple and efficient mechanism of this character which is so constructed that the movement of the spindle into various positions automatically regulates the tension of the driving-belt.

This invention is particularl ap licable for driving the s indle of a radial drill: and it is illustrated and described with reference to such a drill, although it is applicable to other machines having a swinging rotatory spindlesuch, for instance, as a routing-machine.

Figure 1 shows a side elevation of a radialdrill provided with a powertransmitting mechanism which embodies this invention.

Fig. 2 shows a top view of the transmission I is a spindleulley-su ferin thesame.

mechanism. Fig. 3 sh ows atop view of the mechanism,

illustrating an extended use of The frame 1 of the machine shown extends upwardly from a bed 2 and su ports a rotato column 3. Clamped to t e column in suc manner that it may be raised or lowered when desired is the spindle-su porting arm 4, and secured to the upper en of the column ortin arm 5.

The spin le 6 is he by the sleeve 7, carried by the spindle-supporting arm, and is raised and lowered by turning the handle 8 in the'usual manner. The spindle-pulle 9 is keyed to the spindle as customary, so t at its rotation rotates the s indle without interwith the vertica spin e.

When the column is turned, the spindlesupporting arm and the pulley-su porting arm turn with it and carry the spindle about the axis of the column.

The driving-pulley 10, which .may be a cone having one, two, or more stops, is connected with a transmission-pulley 11, these pulleys being mounted on an arbor 12, that is supported at the back of the frame.

' as shown in Fig. 3, the spindle can movement of the Fastenedto the top of the frame is a head 13. On an arbor 14, sup orted at the rear end of the head, are gu1d e'-pulleys 15, and movable in a dovetail groove near the front of the head are slides 16, which'carry vertical arbors 17. These arbors above the head sup ort tightening-pulleys 18 and below the hea they project into a cam-groove 19 in an enlarged arm, whic is fastened to and turns with the column. Mounted onthe front end of the head is an idler-pulle .20.

A single endless be t 21 extends around the transmission-pulley over the guideulleys, between the tighteningulleys, outsi e of the idler-pulley, and aroun When the spindle is swung in either direction about the axis of the column, the cam-groove the spindle-pulley.

ortion of the pulley-supporting in the enlarged portion of the spindle-pulley suplporting arm, acting on the tighteningpu ey arbors, moves the slides and causes the tightening-pulleys to move so as to take u the slack and hold the belttight in all posi' tions of the s indle.

If it is deslred, as shown in Fig. 3, this mechanism may be extended by duplicating the pulley-su porting arms with t grooves and t e slides carrying the tightening-pulleys, which are moved 1n and out by the cam-grooves, when the arms are turned on their axes.

C When there is but a sin le mechanism, as shown in F' 2,-the spin le may be swung about the axis of the column the lar erf'part of a circle, and, when the parts are dup icated, be swun about the axis of the column and also in an 7 out, so that it can bemoved to various positions radially with relation to the axis 0 the column.

Aniachine having a mechanism which embo,

e camower-transmitting which is automatically ept always the same. This results in much savingof time and labor, as no adjusting of the pulleys is required, and it also-reduces the friction to such an extent that large drills may be run at high speed.

This invention is not limited to the details of construction shown, as many other means could be supplied. for automatically moving the ti htemng ulleys without departing from the spirit ol the invention.

ies this invention can be driven by a sin le belt, the tension of on the outer end of the arm, an endless belt extending around both the transmission-pulley and the spindlerpulley, means engaged with and moved by the inner end of the arm, and pulleys mounted on the means moved by the inner end of the arm in such manner as to move relatively with the spindle-pulley and always keep the belt tight, substantially as specified} 2. A mechanism for transmitting power having a transmission-pulleya swinging spindle-pulley, an endless belt extending around the transmission-pulley and the spindle-pulley, and apair of tightening-pulleys moved by the movementof the spindle-pulley for automatically controlling the tension of the belt, substantially as specified.-

3. A mechanism for transmitting power having a transmission-pulley, a swinging spindle-pulley, an endless belt extending around the transmission-pulley and the spindle-pulley, and a pair of tightening-pulleys outside ofthe belt and moved by the movement of the spindle-pulley for automatically controlling the tension of the belt, substantially as specified.

l. A. power-transmitting mechanism having a transmission-pulley, a spindle-pulley, an endless belt extending around the transmission-pulley and the spindle-pulley, an

idler-pulley inside of the belt, and a pair of tightening-pulleys outside of the be t and moved by themovement of the" spindle-pulley for automatically controlling the tension of the belt, substantially as specified.

5. A power-transmitting mechanism having a transmission-pulley, a swinging spindlepu ley, guide-pulleys, an endless belt extendmg around the transmission-pulley, over the guide-pulleys and around the spindle-pulley, an idler-pulley inside of the belt, and a pair of tightening-pulleys outside of the belt and moved by the movement of the spindle-pulley for automatically controlling the tension of the belt, substantially as specified.

6. A power-transmitting mechanism having a transmission-pulley, a swinging spindlepulley, an endless belt extending around the transmission-pulley and the spindle-pulley, slides moved by the movement of the spindle-pulley, and tighteningpulleys carried by the slides for automatically controlling the tension of the belt, substantially as specified 7. A power-transmitting mechanism having a transmission-pulley, a swinging spindlepulley, an endless belt extending around the transmission-pulley and the spindle-pulley, a

cam moved by the movement of the spindlepulley, slides moved by the cam, and tightening pulleys adjacent to the belt carried by the slides, substantially as specified.

DAN IEL M. WRIGHT. Witnesses:

ERASTUS S. Roor,

HARRY R. WILLIAMS. 

